Method of efficient extraction of aluminum, iron, and titanium in coal gangue

A technology of coal gangue and aluminum iron, applied in chemical instruments and methods, ferric sulfate, aluminum sulfate, etc., can solve the problems of single extraction product and high quality requirements of raw materials, achieve high silicon oxide content, ensure conversion rate, and be easy to form into balls Effect

Inactive Publication Date: 2014-09-03
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned method of extracting valuable elements from coal gangue to prepare chemical products has high requirements on the quality of raw materials, and the extracted products are single, and none of them involves the extraction of titanium.

Method used

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  • Method of efficient extraction of aluminum, iron, and titanium in coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Take 10kg of dry coal gangue, powder it and pass it through an 80-mesh sieve, and the sieve residue is less than 5wt%, and set aside;

[0047] (2) Mix the coal gangue in step (1) with sulfuric acid of equal mass and concentration of 98wt% to form balls, then place the balls at 250°C for 1 hour to make clinker, and add 4 times the mass of clinker to the clinker , a sulfuric acid solution with a sulfuric acid concentration of 10wt%, reacted at 90°C for 1 hour to dissolve, and filtered to obtain a dry acid leaching solution; the dissolved residue was prepared with a sulfuric acid solution with a concentration of 10wt% that was equivalent to 4 times the mass of clinker and prepared with water. Washing, the solution after washing is marked as the first washing solution, which is used as the solution for the subsequent acid leaching of clinker, and then washed twice with water that is 4 times the quality of the clinker, and the solution after washing is marked as the secon...

Embodiment 2

[0053] (1) Take the coal gangue and pass it through an 80-mesh sieve after drying and grinding, and the sieve residue is less than 5wt%, and set aside;

[0054] (2) Take 108g of the dried sample of the neutralized filter residue in Example 1, and add 130g of sulfuric acid with a concentration of 98% to form balls based on the acid residue ratio of 1.2, place them in a box furnace, and react at 250°C for 1 hour to obtain cooked After the clinker is taken out, add 324g of the last primary washing solution with a sulfuric acid concentration of 7.5wt%, and react in a three-necked flask for 1 hour at a reaction temperature of 90°C. 324g of 5wt% dilute acid solution is washed for the first time, and 324g of the previous three washing liquids are taken for the second washing, and finally the third washing is carried out with 324g of clear water;

[0055] Through the analysis of acid leaching dissolved slag, based on the percentage of valuable elements in neutralized fresh coal gangue...

Embodiment 3

[0060] (1) Take the coal gangue and pass it through an 80-mesh sieve after drying and grinding, and the sieve residue is less than 5wt%, and set aside;

[0061] (2) Take 130g of the dried sample of the neutralized filter residue in Example 2, and add 130g of acid to mix it with acid residue according to 1.0, put it in a box furnace, and react at 250°C for 1 hour to obtain clinker. After taking out the clinker, add sulfuric acid Concentration is 520g of the last first washing solution of 8wt%, reacted in a three-necked flask for 1h, the reaction temperature was 85°C, after the reaction was finished, it was filtered, and the dissolved residue was prepared with 390g of 10wt% dilute acid solution prepared by the last second washing solution for the first For the first washing, take 390g of the previous third washing solution for the second washing, and finally use 390g of clear water for the third washing;

[0062] Through the analysis of acid leaching dissolved slag, based on the...

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Abstract

The invention discloses a method for efficiently extracting aluminum, iron and titanium from coal gangue, which belongs to the technical field of resource utilization of coal-based solid waste. Coal gangue is used to neutralize the solution of dry-process acid leaching clinker after drying and grinding , the acid concentration or pH value at the end of neutralization is determined according to the titanium oxide content in the acid leaching solution; the neutralization filtrate after the neutralization reaction is used to separate aluminum, iron or aluminum, iron and titanium, and the neutralization filter residue does not need to be washed, after drying Add acid and mix directly, carry out acid leaching reaction in a box-type resistance furnace, dissolve, filter and wash after the reaction, the filtrate is neutralized with fresh coal gangue, and repeat the above operations in a cycle. The dissolution rate of titanium etc. is high, the yield of aluminum is >95%, the yield of iron is >97%, and the yield of titanium is >85%. , Titanium products have opened up new raw material resources, which can realize the high value-added utilization of coal gangue.

Description

technical field [0001] The invention relates to a method for efficiently extracting aluminum, iron and titanium from high-iron and high-titanium coal gangue, and belongs to the technical field of resource utilization of coal series solid waste. Background technique [0002] China is a developing country that uses coal as its main energy source. Coal accounts for more than 70% of primary energy consumption, more than twice the world average. The energy structure is still dominated by coal. [0003] Coal gangue is a kind of solid waste produced in the process of coal production and processing, and it is also one of the largest industrial wastes in my country at the present stage. The massive stockpiling of coal gangue not only occupies land, but also seriously pollutes the surrounding environment, and at the same time causes a waste of resources to a certain extent. Therefore, the comprehensive utilization of coal gangue resources will become a major resource and environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01F7/74C01G23/00C01G49/14
Inventor 夏举佩张召述自桂芹
Owner KUNMING UNIV OF SCI & TECH
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